Weather derivatives are tradable commodities that protect business owners from future changes in the weather.
天气衍生品是一种贸易商品，它能够保护企业所有者免受天气变化的影响。
英语百科
Weather derivative
Weather derivatives are financial instruments that can be used by organizations or individuals as part of a risk management strategy to reduce risk associated with adverse or unexpected weather conditions. The difference from other derivatives is that the underlying asset (rain/temperature/snow) has no direct value to price the weather derivative. See Exotic derivatives.